diff --git a/kernel/kls_ljpeg/ljpeg2ppm/huffd.c b/kernel/kls_ljpeg/ljpeg2ppm/huffd.c
index ea3480c..d5f96a7 100644
--- a/kernel/kls_ljpeg/ljpeg2ppm/huffd.c
+++ b/kernel/kls_ljpeg/ljpeg2ppm/huffd.c
@@ -48,6 +48,9 @@
 
 #define RST0    0xD0	/* RST0 marker code */
 
+/* defined in util.c */
+void FixHuffTbl(HuffmanTable *);
+
 static long getBuffer;		/* current bit-extraction buffer */
 static int bitsLeft;		/* # of unused bits in it */